Motor-rotation impact-tool



H. It STAGE.

MOTOR ROTATION IMPACT TOOL.

APPLICATION FILED 0cT.l15. 1919.

Patented Sept. 13,1921. 119

UNITED STATES PATENT OFFICE.

HAROLD I. STAGE, OF EASTON, PENNSYLVANIA,

ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

' moron-nio'rnrron IMPACT-TOOL.

Specification of Letters Patent.

Patented Sept. 13, 1921.

Application filed October 15, 1919. Serial No. 380,897.

the power to rotate the drill bit or cutting tool.

One of the objects of this invention is to provide a comparatively simple and inexpensive construction for machines of this type. Another object of the invention is to provide a machine which may be universally used but which will be more particularly adapted to the automatic feeding mechanism claimed in my copending application filed September 18. 1919. Serial humber 321,426.

Further objects of the invention will hereinafter appear and the invention consists of the construction and combinations of parts hereinafter more fully described and claimed, having reference to the accompanying drawings, in which W Figure 1 is a side elevation of an impact motor mounted on its carriage wit-h automatic feedin means and with its cylinder partly bro en'away to show the location of the inlet and exhaust valves.

Fig. :2 is a cross section of the hammer cylinder on the line 2-2 of Fig. 1, looking in the direction of the arrows.

Fig. 3 is a. side elevation of Fig. 2 on the opposite side of the cylinder to that shown in Fig. 1.

Fig. 1 is a diagrammatic view of the form shown in Fig. 1 with the piston at'the rear and traveling forward.

Fig. 5 is a view similar to Fig. 1 with the piston at the forward end traveling rearward, and

Fig. 6 is a diagrammatic view of the valve movement.

Figs. 1, 2, and 3 show the location of the parts and the simplicity of the construction of oneof a number of embodiments of the present invention.

Figs. 1. 5, and 6 show the principle of operation of the parts which form the subject matter of the presentinvention.

Referring to the drawings in detail. 1 indicates the drill steel. The cylinder 2, in

which is the piston 3 with the front head 4 carrying the rotation sleeve 7, the cylinder cover 5 carrying the anvil block 6, the rotating motor 8, and the rotating motor and cylin er cover 9, are held together by the side rods 10 and 11.

The spindle 12 of one motor gear extending rearward, on which is slidably keyed the friction spool 13, rotates the friction cone 14, to operate the feed mechanism generally indicated at 15. The adjusting handle 16 is yoked to the spool 13 by the clamping wheel 17. The mounting is igenerally indicated by the reference num- The motor 8 rotates the sleeve '7 by means of suitable gearing and the drive shaft operates the rotary inlet and exhaust valves 20 and 21. These valves are cylindrical sections of shaft 19 fitting in bore 24 and are formed by cutting away two portions of the valvediametrically opposite on each one in such a manner as to bring ports 22 and 23 alternately into communication with that portion of bore 21- between the two valves 20 and 21 which is supplied with motive fluid from the throttle valve 25, and that portion of the bore communicating with the exhaust ports 26 and 2]". It is there fore apparent that one side of each valve is theexhaust side designated by the numbers 28 and 29 Fig. 1, and the other side of each valve is the inlet side, numbered 30 and 31, Fig. 1.

The exhaust chamber 32, into which ports 26 and 27 discharge is shown in Fig. 2, and

and held in position I directs the exhaust forward in the usual manner. Port 33 delivers .motive fluid to the rotating motor 8, from throttle valve 25, port 31 being the motor exhaust. The control port 35 in which is a ball check valve 36 of the usual type. leads from the piston bore of the impact motor to the rotating motor 8,

Y the function of which will be described hereinafter.

Compression chambers are provided .at each end of the piston bore to prevent the piston from striking the cylinder covers 5 and 9. and suitable grooves 37 and 38 are also provided to move the piston 3 out of the compression chambers, to its workin position as for instance on'starting the drill or for reasons that will be understood from the following description of the operation of the drill.

I turn stroke, the valves 20 and 21 having made one half of a revolution while the piston 3 was traveling forward. With the inlet side 31 of valve 21 full' open, as shown, motive fluid hasbeen admitted a suflicient length of time to build up the pressure in front of piston 3, starting it rearward and from this point in its rotation the valve 21 commences to cut off the supply of motive fluid to port 23 and closes it entirely before the piston has made its complete stroke, the expanding volume of fluid driving the piston 3', from this point to the end of its stroke. The unfeathered arrows in diagrams Fig. 4 and Fig. 5 showthe direction of flow of the -motive fluid. The feathered arrows show the direction of piston movement. The

valve diagram Fig. 6 shows both sides of the valves 20 and 21, the valves revolving in the direction of the unfeathered arrows. Side 30 of valve 20 has just finished admitting motive fluid to port 22, while the exhaust side 29 of valve 21 is just closing. The exhaust side 28 of valve 20 is shown opening a little in advance of the inlet side 31 of ering the valve 21. open earlier and close later than the inlet sides.

It will be seen from Fig. 6', that there is a position of the valves at which no fluid is admittedto either side of the piston, should the motor stop with the valve in this position. This condition is equivalent to centering in the air thrown type of valve but is not serious in this case as the rotating motor is seldom if ever entirely stopped by the drill bit sticking or fitchering in average drilling ground.

When the drill is operating in a free hole, the piston stroke is about as shown in Figs. 4: and 5, covering port 35 or slightly uncovort for such a short period .of time that llttle or no fluid is passed through to the motor 8. Now assume that the drill bit enters a seam or fitcher, more work is thrown on the rotating motor 8 causing it .to rotate the shaft 19 and valves 20 and 21 slower, which admits fluid for a longer period of time to the piston bore, throwing piston 3 into the compression chambers, particularly at the rear end, and uncovers port 35 for a longer period of time, admitting a larger volume of motive fluid to the motor 8 to bring it up to its speed again.

The exhaust sides of both valves,

The piston over-traveling in the manner just described sets up excessive recoil of the machine which helps to free the drill bit. This recoil is used to the best advantage with the type of feed shown, as the governor spring 37 of the feeding mechanism takes the shock and allows a substantial movement of the impact motor to take place. The yoke 16 is slidably carried on adjusting rod 38 with the spring 39 forcing the yoke 16 against the collar on rod 38 as shown. The yielding of the spring 39 prevents breakage of the friction drive parts when the motor recoils.

This invention permits a simple, substantial construction of drills of this type and makes use of the recoil which has heretofore been considered ob'ectionable.

I wish it understood that various changes in form proportion and details of construction may be resorted to within the scope of the appended claims and that I do not wish to limit myself to the specific design and construction here shown.

I claim:

1. In a fluid operated percussive tool of the separate motor-driven rotation type, the combination of inlet and exhaust valves operated by the rotating motor and governing means for said rotating motor controlled by the impact motor piston action.

2. In an impact motor of the motor rotated type, the combination of valve mechanism to operate the impact motor piston and means controlled by the action of said impact motor piston to maintain the speed of rotation of the rotating motor, said rotating motor operating the said impact motor valve mechanlsm.

3. In an impact motor of the motor rotation type, the combination of inlet and exhaust valves to operate the impact motor iston controlled by the rotating motor, said inlet valves adapted to admit motive fluid alternately to the forward and rearward ends of said impact motor piston in such manner that the said motive fluid will be used first directly and then expansively to complete each stroke of the said impact motor piston and the said exhaust valves being adapted to permit a free exhaust for the full length of said impact motor piston stroke.

4. In an impact motor of the motor rotation type, the combination of rotation motor control of the impact motor piston operating means, said means controlling the length of said impact motor piston stroke relative to the speed of said rotating motor and means to accelerate and maintain said speed of said rotating motor by the len th of said impact motor piston stroke wien the drill is operating.

5. In an impact motor of the motor rotation type, the combination of inlet and exhaust valves to operate the impact motor piston controlled by the rotation motor, said inlet and exhaust valves being adapted to long-stroke said piston when the rotating motor rotates faster, a port uncovered by the piston and adapted to admit motive fluid to said rotating motor When said piston is long-stroking and adapted to be covered by said piston, admitting no fluid to said rotating motor when said piston is shortstroking', thereby regulating the speed of said rotating motor when drilling.

6. A fluid operated percussive tool of the hammer drill type, having a separate motor for rotating the drill steel, an inlet and exhaust valve for controlling the percussive motor, said valve being operated by the drill steel rotating motor, and governing means for the drill steel rotating motor controlled by the piston of the percussive motor.

7. A fluid operated percussive tool of the hammer drill type, having a separate rotary motor for rotating the drill steel, an inlet and exhaust valve for controlling the percussive motor, said valve being operated by the drill steel rotating motor, and governing means for the drill steel rotating motor controlled by the piston of the percussive motor.-

8. A fluid operated percussive tool of the hammer drill type, havin a separate motor for rotating thedrill stee an inlet and exhaust valve for controlling the percussive motor, said valve being rotated by the drill steel rotating motor, and governing means for the drill steel rotating motor controlled by the piston of the percussive motor.

9. A fluid operated percussive tool of the hammer drill ty e, having a separate rotary motor for rotating the drill steel, an inlet and exhaust valve for controlling the percussive motor, said valve being rotated by the drill steel rotating motor, and governing means for the drill steel rotating motor controlled by the piston of the percussive motor.

10. A fluid operated percussive tool of the hammer drill type, having a separate motor for rotating the drill steel, inlet and exhaust valves operated by said rotating motor for controlling the supply and exhaust of the percussive motor, and means controlled by the piston of said percussive motor for keeping the speed of said separate motor in unison with the reciprocations of the piston of said percussive motor.

11. A fluid operated percussive tool of the hammer drill type, having a separate rotary motor for rotating the drill steel, inlet and exhaust valves operated by said rotating motor for controlling the supply and exhaust of the percussive motor and means controlled by the piston of said percussive motor for keeping the speed of said separate motor in unison with the reciprocations of the piston of said percussive motor.

12. A fluid operated percussive tool of the hammer drill type, having a separate rotary motor for rotating the drill steel, rotary inlet and exhaust valves operated by said rotating motor for controlling the supply and exhaust of the percussive motor and means controlled by the piston of said percussive motor for keeping the speed of said separate motor inunison with the reciprocations of the piston of said percussive motor.

13. A fluid operated percussive tool of the hammer drill type, having a separate motor for rotating the drill steel, inlet and exhaust valves operated by said rotating motor for controlling the supply and exhaust of the percussive motor, and a piston controlled port for admitting motive fluid directly from the impact motor to the rotating motor when the speed of the rotating motor lags behind the speed of the impact motor.

14. In a fluid operated percussive tool of the hammer drill type, having a separate motor for rotating the drill steel, inlet and exhaust valves operated by said rotating -motor for controlling the supply and exhaust of the percussive motor, and a compression chamber for cushioning the piston of the percussive motor at the rear ofthe cylinder, fluid being admitted to the cylinder of the percussive motor for a longer period of time when the speed of the rotating motor falls, due to the sticking of the drill steel, thereby throwing the impact piston into said compression chamber.

15. In a fluid operated percussive tool of the hammer drill type, having a separate motor for rotating the drill steel, inlet and exhaust valves operated by said rotating motor for controlling the supply and exhaust of the percussive motor, and means for cushioning and holding the impact piston at the rear end of the cylinder when the speed of the rotating motor lags behind the speed'of the impact motor.

HAROLD 1. STAGE. 

